Negative battery terminal removed first. Always!! And this has nothing to do with shocking yourself. It is to stop you shorting out your spanner between the chassis of the vehicle and the positive terminal with your spanner when loosening/tightening it.
@@Zeek800 Because it is always positive first, negative second when connecting two batteries together. ALWAYS, in every country in the world, look at your jump start instructions. Positive of dead battery to positive of healthy battery, negative of healthy battery to negative of dead battery. You got confused because when removing or placing a dead or live battery directly into a car with no other battery connected you go negative first then red. Simply put there is a difference between connecting two batteries and replacing a battery. www.shell.com.au/motorists/go-well-content-hub/back-to-basics-how-to-jump-start-a-car.html
1. For safety, always remove negative first. You did get the reassembly sequence right (positive first). 2. Be damn careful not to short the positive battery cable to anything metal.
Because it is always positive first, negative second when connecting two batteries together. ALWAYS, in every country in the world, look at your jump start instructions. Positive of dead battery to positive of healthy battery, negative of healthy battery to negative of dead battery. You got confused because when removing or placing a dead or live battery directly into a car with no other battery connected you go negative first then red. Simply put there is a difference between connecting two batteries and replacing a battery. www.shell.com.au/motorists/go-well-content-hub/back-to-basics-how-to-jump-start-a-car.html www.shell.com.au/motorists/go-well-content-hub/back-to-basics-how-to-jump-start-a-car.html
This is exactly what I do. I see all these videos of connecting a so called "Memory Saver" to the OBD port but that is not needed if you use this method in this video. It is such that the car never actually looses battery power so it does not loose any settings in the multitude of computer modules in the car. Myself, I just use a small 12 volt battery that one would normally find in a riding lawn mower. Never tried a 9 volt battery like in the video, but if nothing else, one could use 8 AA batteries in series and have 12 volts. Myself I would want no less then 11 volts since I am unsure of the low voltage threshold of these modules in newer cars. Still, he clearly showed that this 9 volt setup worked for the vehicle in the video. Cool.
The instructions I give is what is written on the back of code saver unit, buy it and read it yourself I have no connection to the sales of this unit. Because it is always positive first, negative second when connecting two batteries together. ALWAYS, in every country in the world, look at your jump start instructions. Positive of dead battery to positive of healthy battery, negative of healthy battery to negative of dead battery. You got confused because when removing or placing a dead or live battery directly into a car with no other battery connected you go negative first then red. Simply put there is a difference between connecting two batteries and replacing a battery.
i found your vid informative . we came on here to find out how to get to our battery . we are use to the older cars and are grateful that people like you are willing to give up your time to make life easier . if not for you and everyone who does these vids . we would have had to shell out some bucks to get the car towed . so thanks
This wont work on many cars so here is the easier way. Call your mate with a car and connect the cables from your battery with a pair of jump leads to his battery (+ first ...) and make sure you get some nice contact. Then just lift the cables with the jump leads on and replace the battery. It might cost you a drink afterwards but it does always work.
Heres another idea. Use a car/truck battery charger. Connect the Positive (+)/Red jumper from the battery charger to your Alternators Positive (+)/Red connector. Than take the battery chargers Negative (-)/Black connector to any good Ground (-) on your vehicle ie a fender bolt or the hood latch.. some place under the hood with a good Ground (-) connection. Good luck hope this helps.
Let me relate something that happened to a friend of mine, a dentist by trade who likes to work on his sports car occasionally. In preparation for some other work, he elected to remove the battery from the car, using a box wrench to loosen the battery clamps. The wrench made contact with his wedding ring (he's lefthanded), and the ring in turn made contact with the battery holddown. A massive short circuit welded his ring to the holddown and to the wrench, which in turn was welded to the positive terminal.
I have personal knowledge of a generally similar accident. The ring and wrench weren't welded together and to the vehicle, but the ring did a really good imitation of the filament in an incandescent light bulb and nearly completely "cut" the finger flesh around the bone...in effect, an electrical self-amputation. I had never heard of similar accidents and figured this was about as likely as being hit by a meteorite, but your report makes me think maybe these happen with some regularity, that they're just "infrequent" rather than being almost impossibly rare.
You don't have to go through all this. If you have a small 12 volt lawn mower battery, then just clip on the + terminal of the small battery to the + terminal of the car wire and the - terminal of the small battery to the - terminal of the car wire, and then remove the terminals from the car battery, first the positive and then the negative. The you can change your regular car battery. The small battery will keep all the information on the dashboard and radio from disappearing. It takes very little amperage to maintain it.
You should always take off the negative first & put it on last.Not a huge biggie with 12v although it will short out your spanner if you happen to touch it to earth with the positive still connected. On 24v system it is a must, I have seen rings melted into fingers by doing it wrong.
Because it is always positive first, negative second when connecting two batteries together. ALWAYS, in every country in the world, look at your jump start instructions. Positive of dead battery to positive of healthy battery, negative of healthy battery to negative of dead battery. You got confused because when removing or placing a dead or live battery directly into a car with no other battery connected you go negative first then red. Simply put there is a difference between connecting two batteries and replacing a battery. www.shell.com.au/motorists/go-well-content-hub/back-to-basics-how-to-jump-start-a-car.html
Hi - thanks for the great video. I have a mazda 2 neo (2006) where I needed to remove the battery. I decided to go with another 12v car battery (as the donor battery) instead of a 9v. All was going well until my one of my donor clips fell off, so I lost all power. Its possible my car has the ability to remember the settings for a short while, as all I lost was the clock time and speedo travel distance.Just to be sure, in case the ecu was reset, I ran the car for a while at idle to help it.
Hi. Just want to ask, which one is the better method, the one where you place backup power on the battery cable connectors, or through the OBD socket? What are the pros and ocns of each? Thank you in advance.
that's a negative ground battery.You should ALWAYS disconnect the negative terminal FIRST and the positive last.When replacing,connect positive FIRST and negative last!
To the comments of Jose Peixoto & Larry Bui. You are right if you simply replace old for new battery and don't care if settings for radio and clock etc, are wiped out. However, if you want to retain the your settings the the video is correct.
I never heard any one recommend removing the positive first (unless it's a very old or odd car with positive ground.) The vast majority of cars have a negative ground. By removing negative first, you reduce the chances of shorting something to ground. If the wrench being used to remove the negative terminal should touch any grounded part of the car - no damage done. If you go for the + first and touch the tool to metal whilst the + is still connected, it's a direct short circuit of the battery. This could be very dangerous, allowing potentially hundred of amps to flow. Battery could explode, fire could occur, etc. And how could one possibly remove both simultaneously? Loosen both clamps simultaneously? What if the tool touches the car's frame 2 microseconds before you remove & loosen the negative?
There's a diode or some other protection between the 9V battery and the 12V accu. Don't do this with a plain 9V battery! When you directly connect a 9V battery to the 12V car battery , a undefined, possible high charge current will flow from the 12V car battery to the 9V battery. This may blow the 9V battery! Indeed, take care not to have any car lights on (including the interior lights, that switch on when one of the car doors are still open)
I thought the proper procedure for disconneting a battery is to alway undo the negative terminal first, then the postive terminal. And when installing the replacement batter, you reverse the order...positive first...negative last. What is the advantage of doing it as you mentioned??
Because it is always positive first, negative second when connecting two batteries together. ALWAYS, in every country in the world, look at your jump start instructions. Positive of dead battery to positive of healthy battery, negative of healthy battery to negative of dead battery. You got confused because when removing or placing a dead or live battery directly into a car with no other battery connected you go negative first then red. Simply put there is a difference between connecting two batteries and replacing a battery. www.shell.com.au/motorists/go-well-content-hub/back-to-basics-how-to-jump-start-a-car.html
It's a little dangerous. The 12 volt battery (depending on current charge) will be pumping voltage onto the 9 volts beyond it rated capacity, and could cause the 9 volt to heat up and blow. It could also happen during moments you have the new battery installed with your minder still connected.
!!Dont do this with ordinary home made 9V battery ensemble hooked!!. Until you disconnect old 12V battery it will 'charge' small 9V and it is 'no no' to charge nonrechargable battery - they can explode. Even rechargable types are not supposed to be recharged with several amps as here will be the case. Gadget that is shown in video is (hopefully) protected from such scenario.
If anybody wants to make their own memory minder, it's not just a battery with leads. If it was, the car battery would try to charge the 9V battery and perhaps blow it up. There has to be a diode built in that allows current to flow from the 9V battery into the car but not from the car battery into the 9V battery.
@@cmscott Have another look. He connects the 9V battery directly across the battery terminals. That's why I said the car battery will be charging the 9V battery. Can't have that.
@@cmscott I said the car battery would try to charge the 9V battery. The engine doesn't need to be running for that. There needs to be a diode in the memory minder lead to prevent that.
Putting a 9V battery across a 12 V battery will cause potential difference and current starts flowing from 12 V to 9 V. Since the 9V batter is not a rechargeable, it may explode.
Because it is always positive first, negative second when connecting two batteries together. ALWAYS, in every country in the world, look at your jump start instructions. Positive of dead battery to positive of healthy battery, negative of healthy battery to negative of dead battery. You got confused because when removing or placing a dead or live battery directly into a car with no other battery connected you go negative first then red. Simply put there is a difference between connecting two batteries and replacing a battery. www.shell.com.au/motorists/go-well-content-hub/back-to-basics-how-to-jump-start-a-car.html
When I disconnect the battery on a Mitsubish Pajero iO for an extended period it messes up the tick-over. Fixing is simple when you know how, albeit a bit time consuming. Simplified, get the engine warm. Run the engine for 10 minutes, stop the engine. Restart the engine, switch on the air con, fan, open the electric windows, 10 minutes. Stop the engine. Restart the Engine, run for another 10 minutes and tick-over should be OK. I'm not making this up. The good news is that disconnecting the battery doesn't cancel the radio settings. Jack, Japan Alps
The reason to disconnect the negative first on a negative ground vehicle is because if the positive was disconnected first and somehow it accidentally touched any metal part of the vehicle, there would be an instant short. Sparks would fly and the battery may even explode due to the sparks igniting the hydrogen gas from the battery.
Jeez - what's with all the ungrateful comments about it being too long. Use the double playback speed if you're so impatient. I thought it was a good video 👍
Yes, removing the negative cable first ensures that you do not accidentally weld your wrench to any grounded metal when tightening or loosening the positive battery cable. There is no danger of arcing when removing the negative cable first because the frame and the negative terminal is at the same potential.
As cars have advanced changes have been needed in the old days it was the negative first (lead acid battery) so you avoided arcing these days consider the car has an engine control computer and gell and calcium batteries emit little or no hydrogen gas etc. Some suggest to avoid a voltage spike going through the computer's and voltage regulator's circuits remove the positive cable first to de-energize the wiring harnesses. Reconnect the negative cable last to avoid spiking those systems. -cont
Well I see lots of people saying release negative terminal fist which is what I always thought you did but you seem adimant that it’s the other way round. Why , what’s the reason for this please.
This post gets continued comments about the neg should be removed first but when two batteries are involved it is always positive first, negative second when connecting two batteries together. ALWAYS, in every country in the world, look at your jump start instructions. Positive of dead battery to positive of healthy battery, negative of healthy battery to negative of dead battery. People get confused because when removing or placing a dead or live battery directly into a car with no other battery connected you go negative first then red. Simply put there is a difference between connecting two batteries and replacing a battery. www.shell.com.au/motorists/go-well-content-hub/back-to-basics-how-to-jump-start-a-car.html
What is the device you are using that is connected to the battery cable when removing the battery so you don't lose the code or car settings. What's the name and where I can get it from? Thanks your video is very helpful.Thanks!
That doesn't always work as some cigar lighters do not have power unless the key is turned on. Some have power all the time and those would work with the memory saver hooked into the lighter. The lighters that only have power when key is turned on won't have the connection to the power system in order to keep power to the system.
There's s simpler way. Just start the car and leave the car running when you change the battery. The alternator will keep your system happy. Make sure you keep the two terminals insulated during the switch out.
Changed my battery today using this method and easy as and done in 5 minutes with no loss of system. The alternator keeps power to the whole system whilst running.
Great idea but I can't find one of these memory minders for sale anywhere. There are some that plug into the cigarette lighter instead of going onto the battery leads but I don't see how that works.
@@gregmatthies8128 - Thanks. I've now bought a jump starter which has an auxilliary outlet to provide a cigarette lighter-type connection. However, now the weather is warmer the old battery is coping OK so I can wait another year :-)
@@torTxoFognaTuluZ It does work... we hooked up our 12v trickle charger to the input inside my wife's jeep while I swapped out her battery. It worked perfectly, and we didn't reset all of the internal memories for her radio, presets.. etc etc.
For replacing a new battery because of danger of fire caused by spark the black negative cable is always the first cable to remove and the last cable to connect. Some VW and Audi cars may need more than 9v to save memory.
I have used that 9 volt battery device there is no diode it worked ok for me they sell them at auto shops they wouldn't sell them if they were dangerous
The diode has nothing to do with AC. If correctly wired, a diode would prevent the 12V battery from trying to back-feed & charge the lower, 9V battery. That being said, most 9V batteries have enough internal impedance to prevent any substantial current flow to charge, thus little danger exists. I wouldn't leaves it connected this way for hours, but several minutes should not be any problem.
Why did you remove the positive terminal first? What the common wisdom on that is is to remove the negative terminal first in order to lessen the chance of a short through the wrench to the chassis if you remove the positive terminal first. As long as you are careful I doubt it matters much, but the negative first is what I have been told.
heymargaretlook I don't have to make a video to show people how to do this...any fool can make a video. Several companies make an OBD II connected memory saver that connects to a 12 Volts DC source. A 9 volt battery is inadequate, for most applications.
heymargaretlook 1. Charging the car battery. 2. Cleaning the battery posts and clamps. 3. Testing the battery for battery internal resistance. 4. Higher priced autos have a greater memory battery drain. (In other words; it's a bad idea to rely on a battery source that may fail. And, it's just awkward to use the device you are using.)
314Tazo 1.This video has nothing to do with charging a car battery. 2. A 9v dc battery Nothing to do with Cleaning the battery posts and clamps 3. Most multimeters are powered by a 9v dc battery for Testing the battery for internal resistance and work perfectly 4. I suggest you tell the manufactures who worked out their product, patented it and spent a lot money manufacturing they are wrong.
it is always positive first, negative second when connecting two batteries together. ALWAYS, in every country in the world, look at your jump start instructions. Positive of dead battery to positive of healthy battery, negative of healthy battery to negative of dead battery. People get confused because when removing or placing a dead or live battery directly into a car with no other battery connected you go negative first then red. Simply put there is a difference between connecting two batteries and replacing a battery. www.shell.com.au/motorists/go-well-content-hub/back-to-basics-how-to-jump-start-a-car.html
can i use this device to all modern car to avoid the NON START issue when i disconnect the batery lead when i need to make a job on the engine? cause im afraid to disconect negative cable to work on the engine cause im afraid the engine wont start then,,, cause of the DAMN electronics, alarm code or anti theft code *AND I ll be obligated to go to the dealer THATS SOMETHING AS A TECH I DONT WANT TO DO,, can you recommend me a webpage to know more about this stuff
Lin Murphy Orrr...it really doesn't matter. I've never once been shocked and I also place the terminals on with bare hands. Besides, 12v and 24v isn't enough to cause harm and the amperage of a car battery is also not enough to cause harm. Finally, the theories and reasons for putting one or the other on first are easily quashed.
Jake, what difference does it make what the positive terminal of the battery touches once it is off the battery? It is at the same potential as the negative terminal ... how do you get a spark from that? The reason they tell people remove the negative first is that if you do not remove the negative then anything you might happen to touch while removing the positive terminal might short to the negative through the chassis ... which will cause a short, spark, maybe an explosion. Just being careful will work too.
Which ever terminal is removed first could cause a spark because a complete circuit is being broken. The main reason it's recommend to remove negative first is - the wrench, while on the battery terminal, may touch a grounded metal part of the car. If one is removing the negative first, no harm done because the negative cable is already bonded, or connected, to the frame of the car. If you are removing the positive first, and happen to touch the tool to some metal ground, you now have a short circuit of the battery. If you are extremely careful, the positive can be removed first, as long as it is not accidentally shorted to the metal ground of the car.
@@RichardFallstich Yes, people saying black first are following "replace" battery procedure for best safety, but jumpstart procedure is the opposite, positive (of dead) to positive (of live), then negative (of live) to negative (of dead). This is why the instructions of this product say to do it this way, it is battery to battery vs removing a current from a system and adding a current back to a system.
I was thinking about doing like you described but the clamp on the new battery will be in the way when connecting to the car. I prefer to use a backup battery.
Hi mate, can you please tell me what camera and lighting you are using for this video. It looks so professional. I want to buy a camera this weekend and I just saw your vid. thanks.
The memory minder instructions says to connect and remove positive first I suggest you follow your memory minder instructions or ask your dealer before you start.
@@justgivemethetruth Because it is always positive first, negative second when connecting two batteries together. ALWAYS, in every country in the world, look at your jump start instructions. Positive of dead battery to positive of healthy battery, negative of healthy battery to negative of dead battery. You got confused because when removing or placing a dead or live battery directly into a car with no other battery connected you go negative first then red. Simply put there is a difference between connecting two batteries and replacing a battery.
4 years old and you didn't even clean the contact areas of the terminals ? I have to disagree with the Positive OFF and ON first , just for safety's sake alone : ) Nice video quality . Thank you and be well, mate : )
If it is an actual charger and not a maintainer. A maintainer needs to be hooked to a battery that has at least 12V before it will put out anything. a charger outputs 13V or higher regardless.
i mean... if the vehicles are touching it's not really a problem as far as jump starting a vehicle is concerned. if you have no other choice and must jump a car but one of your jumper cables is damaged or you don't have any but can find so single heavy wire that's long enough I don't see why you couldn't park them together and use what you have to connect the hot side. when you hook up it should even be able to arc through paint and fuse on its own but if not you could jump on the hood of one of the cars it would be like if you were connecting a clamp to a crusty old battery terminal.
You can actually also get very cheap 12V A23 Alkaline batteries used for Garage door remotes and other things, following the same considerations to avoid draining the battery. If you were slick you could use the new battery you are installing for this, too. I would wrap stripped copper wire around the terminal posts of the new battery and the other ends of those wires to the appropriate jumper cable ends and clamp the other end of the jumper cable to the connections in the car. Then you can just pull off the copper wires on the posts after you get it connected and mostly installed. You might want to take extra precautions to avoid a short with all the bare hot ends floating around, though. Maybe not jumper cables after all. Just two wires with alligator clips at on end and bare wire at the other.
Hi I have a 2007 model BF Mk2 and my car keeps all radio codes and settings if you remove the battery you just need to press FM and all the presets are there!!!
How does this not blow up your 9 volt battery by shorting 12 Volts 13 Amps through it in a dramatic dangerous explosion? I guess you are relying on the battery being Dead? however I dont think that's a good idea unless you check first with a meter.
It's an anti theft feature in the radio i just bought a 99 Yukon and i have no idea if it is activated or what the code is .O well i need a new radio anyway!
![Felix "Unfair" | [Stray Kids : SKZ-PLAYER]](http://i.ytimg.com/vi/Oswujxm2Ag0/mqdefault.jpg)
Negative battery terminal removed first. Always!! And this has nothing to do with shocking yourself. It is to stop you shorting out your spanner between the chassis of the vehicle and the positive terminal with your spanner when loosening/tightening it.
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I thought everyone knew that. My son is an electrician. He started laughing when he heard this guy say positive first.
@@Zeek800 did you tell him the other battery was a 9v battery with no diode.
@@Zeek800 Because it is always positive first, negative second when connecting two batteries together. ALWAYS, in every country in the world, look at your jump start instructions. Positive of dead battery to positive of healthy battery, negative of healthy battery to negative of dead battery. You got confused because when removing or placing a dead or live battery directly into a car with no other battery connected you go negative first then red. Simply put there is a difference between connecting two batteries and replacing a battery. www.shell.com.au/motorists/go-well-content-hub/back-to-basics-how-to-jump-start-a-car.html
@@heymargaretlook yup my jumper cables come in a yellow plastic zip up bag that has the order to attach the clamps listed on it.
1. For safety, always remove negative first. You did get the reassembly sequence right (positive first).
2. Be damn careful not to short the positive battery cable to anything metal.
Because it is always positive first, negative second when connecting two batteries together. ALWAYS, in every country in the world, look at your jump start instructions. Positive of dead battery to positive of healthy battery, negative of healthy battery to negative of dead battery. You got confused because when removing or placing a dead or live battery directly into a car with no other battery connected you go negative first then red. Simply put there is a difference between connecting two batteries and replacing a battery. www.shell.com.au/motorists/go-well-content-hub/back-to-basics-how-to-jump-start-a-car.html www.shell.com.au/motorists/go-well-content-hub/back-to-basics-how-to-jump-start-a-car.html
This is exactly what I do. I see all these videos of connecting a so called "Memory Saver" to the OBD port but that is not needed if you use this method in this video. It is such that the
car never actually looses battery power so it does not loose any settings in the multitude of computer modules in the car. Myself, I just use a small 12 volt battery that one would normally find in a riding lawn mower. Never tried a 9 volt battery like in the video, but if nothing
else, one could use 8 AA batteries in series and have 12 volts. Myself I would want no less then 11 volts since I am unsure of the low voltage threshold of these modules in newer cars.
Still, he clearly showed that this 9 volt setup worked for the vehicle in the video. Cool.
At 7:50 he's got it backwards...when removing the cables, always remove Black/Negative clamp FIRST before then removing the Red/Positive clamp LAST.
The instructions I give is what is written on the back of code saver unit, buy it and read it yourself I have no connection to the sales of this unit. Because it is always positive first, negative second when connecting two batteries together. ALWAYS, in every country in the world, look at your jump start instructions. Positive of dead battery to positive of healthy battery, negative of healthy battery to negative of dead battery. You got confused because when removing or placing a dead or live battery directly into a car with no other battery connected you go negative first then red. Simply put there is a difference between connecting two batteries and replacing a battery.
i found your vid informative . we came on here to find out how to get to our battery . we are use to the older cars and are grateful that people like you are willing to give up your time to make life easier . if not for you and everyone who does these vids . we would have had to shell out some bucks to get the car towed . so thanks
MrRosiesfavorites was tee
This wont work on many cars so here is the easier way.
Call your mate with a car and connect the cables from your battery with a pair of jump leads to his battery (+ first ...) and make sure you get some nice contact. Then just lift the cables with the jump leads on and replace the battery. It might cost you a drink afterwards but it does always work.
Both replies are perfect! Thanks Mates.. Eddie J... Lake Grove N.Y.
Heres another idea. Use a car/truck battery charger. Connect the Positive (+)/Red jumper from the battery charger to your Alternators Positive (+)/Red connector. Than take the battery chargers Negative (-)/Black connector to any good Ground (-) on your vehicle ie a fender bolt or the hood latch.. some place under the hood with a good Ground (-) connection. Good luck hope this helps.
Let me relate something that happened to a friend of mine, a dentist by trade who likes to work on his sports car occasionally. In preparation for some other work, he elected to remove the battery from the car, using a box wrench to loosen the battery clamps. The wrench made contact with his wedding ring (he's lefthanded), and the ring in turn made contact with the battery holddown. A massive short circuit welded his ring to the holddown and to the wrench, which in turn was welded to the positive terminal.
Electricians dont wear rings for similar reasons
I have personal knowledge of a generally similar accident. The ring and wrench weren't welded together and to the vehicle, but the ring did a really good imitation of the filament in an incandescent light bulb and nearly completely "cut" the finger flesh around the bone...in effect, an electrical self-amputation.
I had never heard of similar accidents and figured this was about as likely as being hit by a meteorite, but your report makes me think maybe these happen with some regularity, that they're just "infrequent" rather than being almost impossibly rare.
Whether it's negative or positive, thanks for taking the time to post this helpful video.
G'day from Glasgow
Followed this today with my FG and worked like a charm. Thanks mate
You don't have to go through all this. If you have a small 12 volt lawn mower battery, then just clip on the + terminal of the small battery to the + terminal of the car wire and the - terminal of the small battery to the - terminal of the car wire, and then remove the terminals from the car battery, first the positive and then the negative. The you can change your regular car battery. The small battery will keep all the information on the dashboard and radio from disappearing. It takes very little amperage to maintain it.
Yes - that's what I would do -
Finally found one with the same radio! Gives me more confidence, thanks mate!👍🏼👍🏼👍🏼🤓
Thank you for showing ALL the steps
You should always take off the negative first & put it on last.Not a huge biggie with 12v although it will short out your spanner if you happen to touch it to earth with the positive still connected. On 24v system it is a must, I have seen rings melted into fingers by doing it wrong.
Electricians dont wear rings for similar reasons
Because it is always positive first, negative second when connecting two batteries together. ALWAYS, in every country in the world, look at your jump start instructions. Positive of dead battery to positive of healthy battery, negative of healthy battery to negative of dead battery. You got confused because when removing or placing a dead or live battery directly into a car with no other battery connected you go negative first then red. Simply put there is a difference between connecting two batteries and replacing a battery. www.shell.com.au/motorists/go-well-content-hub/back-to-basics-how-to-jump-start-a-car.html
Nice! A little long, but informative.
Hi - thanks for the great video. I have a mazda 2 neo (2006) where I needed to remove the battery. I decided to go with another 12v car battery (as the donor battery) instead of a 9v. All was going well until my one of my donor clips fell off, so I lost all power. Its possible my car has the ability to remember the settings for a short while, as all I lost was the clock time and speedo travel distance.Just to be sure, in case the ecu was reset, I ran the car for a while at idle to help it.
Hi. Just want to ask, which one is the better method, the one where you place backup power on the battery cable connectors, or through the OBD socket? What are the pros and ocns of each? Thank you in advance.
This Worked For Me With My Battery Saver !!!!!!!!
can you use a battery charger instead of the 9v? how long will the 9v last?
that's a negative ground battery.You should ALWAYS disconnect the negative terminal FIRST and the positive last.When replacing,connect positive FIRST and negative last!
I´m lost here; some say +,some say-; I think it´s best to remove both at the same time ,that´s what I´ll do from now on
Rule of thumb is always remove the negative terminal first.
To the comments of Jose Peixoto & Larry Bui. You are right if you simply replace old for new battery and don't care if settings for radio and clock etc, are wiped out. However, if you want to retain the your settings the the video is correct.
I never heard any one recommend removing the positive first (unless it's a very old or odd car with positive ground.) The vast majority of cars have a negative ground. By removing negative first, you reduce the chances of shorting something to ground. If the wrench being used to remove the negative terminal should touch any grounded part of the car - no damage done. If you go for the + first and touch the tool to metal whilst the + is still connected, it's a direct short circuit of the battery. This could be very dangerous, allowing potentially hundred of amps to flow. Battery could explode, fire could occur, etc.
And how could one possibly remove both simultaneously? Loosen both clamps simultaneously? What if the tool touches the car's frame 2 microseconds before you remove & loosen the negative?
Because he's using external power, if he removes the negative first he'll lose his settings.
There's a diode or some other protection between the 9V battery and the 12V accu. Don't do this with a plain 9V battery! When you directly connect a 9V battery to the 12V car battery , a undefined, possible high charge current will flow from the 12V car battery to the 9V battery. This may blow the 9V battery!
Indeed, take care not to have any car lights on (including the interior lights, that switch on when one of the car doors are still open)
Excellent advice!
This is why in this case the positive is removed first
I thought the proper procedure for disconneting a battery is to alway undo the negative terminal first, then the postive terminal. And when installing the replacement batter, you reverse the order...positive first...negative last. What is the advantage of doing it as you mentioned??
Because it is always positive first, negative second when connecting two batteries together. ALWAYS, in every country in the world, look at your jump start instructions. Positive of dead battery to positive of healthy battery, negative of healthy battery to negative of dead battery. You got confused because when removing or placing a dead or live battery directly into a car with no other battery connected you go negative first then red. Simply put there is a difference between connecting two batteries and replacing a battery. www.shell.com.au/motorists/go-well-content-hub/back-to-basics-how-to-jump-start-a-car.html
It's a little dangerous. The 12 volt battery (depending on current charge) will be pumping voltage onto the 9 volts beyond it rated capacity, and could cause the 9 volt to heat up and blow. It could also happen during moments you have the new battery installed with your minder still connected.
Shouldn't put videos out that are wrong in every aspect stick to pen pushing .
Not using the device shown. These devices have (or should all have) have an inline diode so no current can flow into the 9V battery.
@@antonystringfellow5152 Good point, Dont try and make up your own with just battery and wires.
Can you also just attach a charged 12v battery booster's clips (Nocco) as well instead of the Duracell battery?
good information but dude, Please! get to the point!!!
Never presume everybody is as knowledgeable as you.
You need those fast talking yanks...lol
the ladies must love him because he takes his time
!!Dont do this with ordinary home made 9V battery ensemble hooked!!. Until you disconnect old 12V battery it will 'charge' small 9V and it is 'no no' to charge nonrechargable battery - they can explode. Even rechargable types are not supposed to be recharged with several amps as here will be the case.
Gadget that is shown in video is (hopefully) protected from such scenario.
Djordje Stevovic The device must have a diode to prevent back-flow of current. It would be easy to home-brew if you have the skills.
If I disconnect the 12 volt first then there's no point of putting the 9 v because everything is gone you fucking idiot
This video could have been about two minutes long, geez.. I love the term 'ring spinner', That's great.
he he glad you like the term "ring spanner" but that's what we use here cheers
@@heymargaretlook NZ to be sure!
@@mikechapman7015
A rung spenner?
good video but always disconnect negative first
Great video! Thanks from Canada.
If anybody wants to make their own memory minder, it's not just a battery with leads. If it was, the car battery would try to charge the 9V battery and perhaps blow it up. There has to be a diode built in that allows current to flow from the 9V battery into the car but not from the car battery into the 9V battery.
Not true. If the vehicle isn't running, there's nothing (alternator) running which generates any power. Current can only be drawn by the vehicle.
@@cmscott Have another look. He connects the 9V battery directly across the battery terminals. That's why I said the car battery will be charging the 9V battery. Can't have that.
@@cmscott I said the car battery would try to charge the 9V battery. The engine doesn't need to be running for that. There needs to be a diode in the memory minder lead to prevent that.
What are "pacific settings" mentioned @ 00.50 ?
looool it's specific,not pacific :)
It’s a common mistake that Aussies make for some reason.
Use "atlantic settings" if you live on the east coast of US.
Putting a 9V battery across a 12 V battery will cause potential difference and current starts flowing from 12 V to 9 V. Since the 9V batter is not a rechargeable, it may explode.
Because it is always positive first, negative second when connecting two batteries together. ALWAYS, in every country in the world, look at your jump start instructions. Positive of dead battery to positive of healthy battery, negative of healthy battery to negative of dead battery. You got confused because when removing or placing a dead or live battery directly into a car with no other battery connected you go negative first then red. Simply put there is a difference between connecting two batteries and replacing a battery. www.shell.com.au/motorists/go-well-content-hub/back-to-basics-how-to-jump-start-a-car.html
Worked on my 2008 Toyota Hilux. All settings saved.
I don't have a 9V memory thingy. Would it work if I plugged my car with booster cables on another car? And would it be safe?
Yup
Great video, really informative. Thanks so much!!
Glad it was helpful!
When I disconnect the battery on a Mitsubish Pajero iO for an extended period it messes up the tick-over. Fixing is simple when you know how, albeit a bit time consuming. Simplified, get the engine warm. Run the engine for 10 minutes, stop the engine. Restart the engine, switch on the air con, fan, open the electric windows, 10 minutes. Stop the engine. Restart the Engine, run for another 10 minutes and tick-over should be OK. I'm not making this up.
The good news is that disconnecting the battery doesn't cancel the radio settings.
Jack, Japan Alps
The reason to disconnect the negative first on a negative ground vehicle is because if the positive was disconnected first and somehow it accidentally touched any metal part of the vehicle, there would be an instant short. Sparks would fly and the battery may even explode due to the sparks igniting the hydrogen gas from the battery.
Jeez - what's with all the ungrateful comments about it being too long. Use the double playback speed if you're so impatient. I thought it was a good video 👍
yes ive always removed the negstive lead first so theres no spark opr charge
Yes, removing the negative cable first ensures that you do not accidentally weld your wrench to any grounded metal when tightening or loosening the positive battery cable. There is no danger of arcing when removing the negative cable first because the frame and the negative terminal is at the same potential.
As cars have advanced changes have been needed in the old days it was the negative first (lead acid battery) so you avoided arcing these days consider the car has an engine control computer and gell and calcium batteries emit little or no hydrogen gas etc. Some suggest to avoid a voltage spike going through the computer's and voltage regulator's circuits remove the positive cable first to de-energize the wiring harnesses. Reconnect the negative cable last to avoid spiking those systems. -cont
Will an obd memory saver still do that same thing and keep the settings/tuning in my aftermarket head unit the same
9V will backup 12V? Not just the radio but the entire computer system?
I have a portable 12v jumpstarter... ¿it is safe to use it for this purpose?
I think yes, you can use it as a power supply.
Connecting a 9V battery across a 12V battery doesn't blow the smoke out of the 9V battery?
Well I see lots of people saying release negative terminal fist which is what I always thought you did but you seem adimant that it’s the other way round. Why , what’s the reason for this please.
This post gets continued comments about the neg should be removed first but when two batteries are involved it is always positive first, negative second when connecting two batteries together. ALWAYS, in every country in the world, look at your jump start instructions. Positive of dead battery to positive of healthy battery, negative of healthy battery to negative of dead battery. People get confused because when removing or placing a dead or live battery directly into a car with no other battery connected you go negative first then red. Simply put there is a difference between connecting two batteries and replacing a battery. www.shell.com.au/motorists/go-well-content-hub/back-to-basics-how-to-jump-start-a-car.html
Hey mate can I use battery charger instead of 9v battery gadget until I replace the battery?
Instead of a 9volt battery, can I use another 12 volt battery?
of course! That is the voltage of the car battery, :)
What is the device you are using that is connected to the battery cable when removing the battery so you don't lose the code or car settings. What's the name and where I can get it from? Thanks your video is very helpful.Thanks!
+Isse Ali It's called a memory minder and should be available at car accessories outlets.
+heymargaretlook got it thanks!
heymargaretlook
heymargaretlook
where did find one of those battery pack with those clips?....
colin s Any car accessories business should stock this
Hi, thanks for share...
One question... would be it the same, if I connect the memory saver directly to
lighter cigar?
That doesn't always work as some cigar lighters do not have power unless the key is turned on. Some have power all the time and those would work with the memory saver hooked into the lighter. The lighters that only have power when key is turned on won't have the connection to the power system in order to keep power to the system.
Thanks for introducing the 9v battery minder
Good video, Can you do the same using the supply from a 12v car battery charger?
No.
good video thank you ,I recently changed battery had problems for about a week then everything fine car computer reset itself
There's s simpler way. Just start the car and leave the car running when you change the battery. The alternator will keep your system happy. Make sure you keep the two terminals insulated during the switch out.
Could cause damage on newer cars.
Most modern cars shut right off :/
Changed my battery today using this method and easy as and done in 5 minutes with no loss of system. The alternator keeps power to the whole system whilst running.
This may destroy alternator diodes. Ask me how I know.
Great idea but I can't find one of these memory minders for sale anywhere. There are some that plug into the cigarette lighter instead of going onto the battery leads but I don't see how that works.
Ray Stroud mate as a mechanic the cig lighter is connected to electrical system and
Sorry didn’t,t finish. This then powers the electrical system and keeps alive the memory to the car including the computer.
@@gregmatthies8128 - Thanks. I've now bought a jump starter which has an auxilliary outlet to provide a cigarette lighter-type connection. However, now the weather is warmer the old battery is coping OK so I can wait another year :-)
Couldn't you use a trickle charger/battery charger using a port on the inside of the car?
@@torTxoFognaTuluZ It does work... we hooked up our 12v trickle charger to the input inside my wife's jeep while I swapped out her battery. It worked perfectly, and we didn't reset all of the internal memories for her radio, presets.. etc etc.
This helped me 😁 thank you
Do you know where I can find the battery that connect to the lighter to save the codes?
For replacing a new battery because of danger of fire caused by spark the black negative cable is always the first cable to remove and the last cable to connect. Some VW and Audi cars may need more than 9v to save memory.
Using a 9 volt is fine but it must have a diode in series to prevent feed from the car battery..
I have used that 9 volt battery device
there is no diode
it worked ok for me
they sell them at auto shops
they wouldn't sell them if they were dangerous
You must have one of those new A/C batteries they sell to the not very smart people.
The diode has nothing to do with AC. If correctly wired, a diode would prevent the 12V battery from trying to back-feed & charge the lower, 9V battery. That being said, most 9V batteries have enough internal impedance to prevent any substantial current flow to charge, thus little danger exists. I wouldn't leaves it connected this way for hours, but several minutes should not be any problem.
Why did you remove the positive terminal first?
What the common wisdom on that is is to remove
the negative terminal first in order to lessen the
chance of a short through the wrench to the chassis
if you remove the positive terminal first.
As long as you are careful I doubt it matters much,
but the negative first is what I have been told.
Can I use a 12V PB battery instead of the 9V shown here?. I do not want to blow the onboard computer.
Again people who say they can do it a different way or already have a model car that retains these setting, so why are you here?
314Tazo Typical of a armchair troll and like most has not made one video.
heymargaretlook
I don't have to make a video to show people how to do this...any fool can make a video.
Several companies make an OBD II connected memory saver that connects to a 12 Volts DC source.
A 9 volt battery is inadequate, for most applications.
314Tazo Just what are those applications
heymargaretlook
1. Charging the car battery.
2. Cleaning the battery posts and clamps.
3. Testing the battery for battery internal resistance.
4. Higher priced autos have a greater memory battery drain.
(In other words; it's a bad idea to rely on a battery source that may fail. And, it's just awkward to use the device you are using.)
314Tazo 1.This video has nothing to do with charging a car battery.
2. A 9v dc battery Nothing to do with Cleaning the battery posts and clamps
3. Most multimeters are powered by a 9v dc battery for Testing the battery for internal resistance and work perfectly
4. I suggest you tell the manufactures who worked out their product, patented it and spent a lot money manufacturing they are wrong.
I can hear your pooch in the background breathing, I think. It is good to know you had an audience right there,
LOL cheers
hey can I find that little battery holder thing
I got one at Autobarn 5 years ago
i was always told to disconnect the neg terminal first- you didnt-- any difference??
it is always positive first, negative second when connecting two batteries together. ALWAYS, in every country in the world, look at your jump start instructions. Positive of dead battery to positive of healthy battery, negative of healthy battery to negative of dead battery. People get confused because when removing or placing a dead or live battery directly into a car with no other battery connected you go negative first then red. Simply put there is a difference between connecting two batteries and replacing a battery. www.shell.com.au/motorists/go-well-content-hub/back-to-basics-how-to-jump-start-a-car.html
Always remove the negative cable first!
Right on!
hi may i know what devices is that?
do you have the link?
@Moh Hin Lee
Heres a link to the Projecta memory minder in the video.
www.autoelec.com.au/projecta-battery-memory-security-code-radio-saver
Does this work on all modern cars? And what do I do if I have a car were the lighter only comes on in the on position?
What is the name of that 9 vold device if I want to buy
@@torTxoFognaTuluZ oh thanks Sir
can i use this device to all modern car to avoid the NON START issue when i disconnect the batery lead when i need to make a job on the engine? cause im afraid to disconect negative cable to work on the engine cause im afraid the engine wont start then,,, cause of the DAMN electronics, alarm code or anti theft code *AND I ll be obligated to go to the dealer THATS SOMETHING AS A TECH I DONT WANT TO DO,, can you recommend me a webpage to know more about this stuff
WRONG! Start by removing NEGATIVE first, then positive.
Lin Murphy Orrr...it really doesn't matter. I've never once been shocked and I also place the terminals on with bare hands. Besides, 12v and 24v isn't enough to cause harm and the amperage of a car battery is also not enough to cause harm.
Finally, the theories and reasons for putting one or the other on first are easily quashed.
scbonduk I do the same, never have I been harmed by taking off positive first or vise versa
Jake, what difference does it make what the positive terminal of the battery touches once it is off the battery? It is at the same potential as the negative terminal ... how do you get a spark from that?
The reason they tell people remove the negative first is that if you do not remove the negative then anything you might happen to touch while removing the positive terminal might short to the negative through the chassis ... which will cause a short, spark, maybe an explosion.
Just being careful will work too.
Which ever terminal is removed first could cause a spark because a complete circuit is being broken. The main reason it's recommend to remove negative first is - the wrench, while on the battery terminal, may touch a grounded metal part of the car. If one is removing the negative first, no harm done because the negative cable is already bonded, or connected, to the frame of the car. If you are removing the positive first, and happen to touch the tool to some metal ground, you now have a short circuit of the battery. If you are extremely careful, the positive can be removed first, as long as it is not accidentally shorted to the metal ground of the car.
@@RichardFallstich Yes, people saying black first are following "replace" battery procedure for best safety, but jumpstart procedure is the opposite, positive (of dead) to positive (of live), then negative (of live) to negative (of dead). This is why the instructions of this product say to do it this way, it is battery to battery vs removing a current from a system and adding a current back to a system.
good job well done , thank you very much
The best way for me is use a jumper cable and clamp it to the new battery while disconnecting and removal of the old battery.
I was thinking about doing like you described but the clamp on the new battery will be in the way when connecting to the car. I prefer to use a backup battery.
Will it work the same way in a hybrid car dear friend?
thank you for the very good video.
Hi mate, can you please tell me what camera and lighting you are using for this video. It looks so professional. I want to buy a camera this weekend and I just saw your vid. thanks.
Very good video and complete! Enjoyed it! Informative. Thanks.
cheers
what about running the engine while replacing the battery?
That can fry your computers and electronics in a new car. DON'T DO IT!!!
Thank you. Nice and clear.
The memory minder instructions says to connect and remove positive first I suggest you follow your memory minder instructions or ask your dealer before you start.
I wonder why ... do they list a reason, or do you guys in Australia just do everything backwards!? ;-)
@@justgivemethetruth Because it is always positive first, negative second when connecting two batteries together. ALWAYS, in every country in the world, look at your jump start instructions. Positive of dead battery to positive of healthy battery, negative of healthy battery to negative of dead battery. You got confused because when removing or placing a dead or live battery directly into a car with no other battery connected you go negative first then red. Simply put there is a difference between connecting two batteries and replacing a battery.
@@geroutathat Yes I am so tired of people who confront me on this.
@@justgivemethetruth Because you are connecting a 9v battery
I need to send my ECU off so I would be able to leave it on a memory minder for 7-10 days possibly longer?
4 years old and you didn't even clean the contact areas of the terminals ?
I have to disagree with the Positive OFF and ON first , just for safety's sake alone : )
Nice video quality . Thank you and be well, mate : )
Negative off first. Taking the pos off first could get you some real current up the arm if you touch something metal whilst turning the wrench
Read the instructions
I just leave my car on and replace the battery I've done it twice, I'm guessing these newer vehicles wont stay on if you remove the battery?
Wouldn't that cause an electric surge from 12v car battery to 9v battery and cause 9v to blow?
No it's a on the market product, they would have done the all testing.
I wonder if a trickle charger would do the same thing?
LeeC58
If it is an actual charger and not a maintainer. A maintainer needs to be hooked to a battery that has at least 12V before it will put out anything. a charger outputs 13V or higher regardless.
Do you need to have the key position in Accessories or Ignition?
i mean... if the vehicles are touching it's not really a problem as far as jump starting a vehicle is concerned. if you have no other choice and must jump a car but one of your jumper cables is damaged or you don't have any but can find so single heavy wire that's long enough I don't see why you couldn't park them together and use what you have to connect the hot side. when you hook up it should even be able to arc through paint and fuse on its own but if not you could jump on the hood of one of the cars it would be like if you were connecting a clamp to a crusty old battery terminal.
Gracias por compartir conocimientos.
You can actually also get very cheap 12V A23 Alkaline batteries used for Garage door remotes and other things, following the same considerations to avoid draining the battery. If you were slick you could use the new battery you are installing for this, too. I would wrap stripped copper wire around the terminal posts of the new battery and the other ends of those wires to the appropriate jumper cable ends and clamp the other end of the jumper cable to the connections in the car. Then you can just pull off the copper wires on the posts after you get it connected and mostly installed. You might want to take extra precautions to avoid a short with all the bare hot ends floating around, though. Maybe not jumper cables after all. Just two wires with alligator clips at on end and bare wire at the other.
Why do people have to be so negative first!
Good idea with a small power supply!
All sais youtubers are battery experts.... & have nothing else better to do
Hey bloke, your steering wheel is on the wrong side! PS the dingo ate the baby.......:)
Thank you sir , you are very useful
Hi I have a 2007 model BF Mk2 and my car keeps all radio codes and settings if you remove the battery you just need to press FM and all the presets are there!!!
I used a little 2 amp battery charger .
I thought you were supposed to disconnect the negative first?
Very Nice, Thanks . Bob
How does this not blow up your 9 volt battery by shorting 12 Volts 13 Amps through it in a dramatic dangerous explosion? I guess you are relying on the battery being Dead? however I dont think that's a good idea unless you check first with a meter.
Very Good Thank You Sir
I have to say, what was wrong with the old radios that kept the station presets independent of whatever the hell you do with your battery?
It's an anti theft feature in the radio i just bought a 99 Yukon and i have no idea if it is activated or what the code is .O well i need a new radio anyway!